Pneumatic-coupler for organs.



No. 650,390. Patented May 29', I900.

E. c. HISCOCK.

PNEUMATIC COUPLER FOR URGANS.

IApplication filed Feb. 1, 1900.\

(No Model.)

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EMORY C. HISCOCK, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE IV. W.

KIMBALL COMPANY, OF SAME PLACE.

PN EU MATIC-COUPLER FOR ORGANS.

SPECIFICATION forming part of Letters Patent No. 650,390, dated May 29,1900.

Application filed February 1, 1900. Serial No. 3,559. (No model.)

To (LZZ whom it may concern:

Be it known that I, EMORY C. HISCOOK, a citizen of the United States,residing in Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Pneumatic-Couplers for Organs,of which the following is a specification.

This invention relates to that class of pneumatic-couplers by which themotor-supply channels of two notes adapted to be sounded together may becoupled so they will be thus sounded, and particularly to that varietyof such couplers in which the channel of one of the notes is providedwith an opening in its side leading to the outer air and through whichits motor may be exhausted and with a valve or valves controlled whenthe coupler is being used by a membrane in the other channel and actingboth to close said side opening and to prevent the escape of air fromthe source of supply while the motor is exhausted, the valves being alsoprovided with an eXteriorly-located controlling-motor which preventstheir operating unless the couplerstop is pulled. As heretoforeconstructed these couplers have been subject to one seriousdifficulty-viz, the leakage of the air around the valve-stems at thepoints where they pass through the side walls of the channels to theirjunction with said stop-motors. As the latter are normally inflated andas a large number of the couplers are usually embodied in an organ theleakage produces a humming or buzzing noise, which is very objectionable, and, moreover, it tends to nullify and render sluggish theexhaustion of the motor-channels when the keys of the channels arestruck. To remedy this difficulty, I have been led to make the presentinvention, in which I locate the stop-motor between the valves and thecompanion channel and in such relation as to obviate the leakagereferred to.

The nature of my invention is fully set forth in the subjoineddescription and illustrated in the accompanying drawing, in which isshown a vertical section of a part of an organ embodying my invention.

In said drawing, A represents one of the keys of the great-organ series,B the corresponding air-channel, leading to the motor valves to the key.

controlling the speaking-pipe of said key, and C and D are valvescontrolling said channel and connected by a stem common to both Thevalve C is the exhaust-valve and is normally closed, while valve D isnormally open and is located in compressed-air-supply chamber F andprevents ihe escape of air therefrom when valve C is opened.

Gis one of the keys of the swell-organ series,

and H its corresponding motor-channel, leading to the motor of the pipeof key G.

J and K are valves similar to valves C and,

D, and M is the compressed-air-supply chain ber similar to chamber F ofthe other key.

In one side of channel II is a port H, opening directly to the. outerair and closed by valve 0, mounted on stem 0, supported at one end andoperated in one direction by membranes P and P and supported at theother end in a blind opening 0 in the wall of chamber H. The membrane Pis located in a chamber formed at the side of channel B and is inflatedby air therefrom, and of course is deflated when that channel isdeflated. The membrane P, which is the stop-membrane and under thecontrol of the player by means of the coupler-stop, is located, asshown, between the valve and membrane P, with its outer surface exposedto the outer air and its inner surface normally inflated by theair-trunk T. This trunk deflates whenever the coupler-stop is pulled soas to allow the valve to shift. The trunk is located upon one side of awall P and the chamber of membrane P upon the other side thereof. In thechamber of membrane P and back of said membrane is a blind space Phaving no outlet, and the stem of the valve emerges in this space fromsaid wall. In channel II is an offset forming a seat for a second valve0 also mounted on stem 0 in such relation that it moves to its seat whenthe stem is shifted in opening valve 0. When thus closed, the valve 0prevents any access by the compressed air from chamber M to that portionof channel H lying beyond said valve.

The operation of the device is substantially that of previousconstructions and will be fully understood from the patent to Hedgeland,No. 590,545, of September 21, 1897, ex-

cept that the leakage around the valve-stem in the Hedgelandconstruction is prevented, inasmuch as said stem instead of passing fromtrunk T into channel H passes in my improved construction through theWall separating trunk T from the blind space in the chamber of membraneP, so that all injurious leakage around the stem is prevented.

1. A pneumatic-coupler for coupling two motor-channels, one of which hasan exhaustport in its side, a valve closing said port and astop-motorfor normally closing the valve, a stem connecting said valve and motorand passing through a wall separating the Windtrunk of said motor from ablind chamber at the other side of the wall, in combination with saidblind chainbensubstantially as specified.

2. In a pneumatic-coupler, the combination of valve 0, a stem for saidvalve, a mem brane P to which the valve-stem is joined, said stempassing from the wind-trunk of said membrane through the Wall separatingsaid trunk from a blind chamber at the other side of said wall and saidblind chamber, substantially as specified.

I 3. The combination with the valve controlling the coupling of thechannels and means for operating the valve, of the Wall P through whichthe stem of the valve passes, the compressed-air chambers at one side ofsaid wall,

and a blind chamber at the other-side thereof, substantially asspecified.

4. In a pneumatic-coupler, a valve-stem O in combination withmotor-channels B and H, membrane P and membrane P and windtrunk forcontrolling said membrane, said wind-trunk being located at one side ofa wall through which said stem passes, and a blind chamber at the backof said membrane Pat the other side of said wall, substantially asspecified.

5. In a pneumatic-coupler, the combination with the coupled channels andthe valvestem and the wall through which it passes, of a compressed-airpassage at one side of said wall and a blind chamber at the other sidethereof, whereby injurious leakage of the compressed air around the stemis prevented, substantially as specified.

6. The combination with the valve-stem and the wall through which itpasses, of a compressed-air passage or chamber at one side of said wall,and a membrane-motor at the other side thereof, the latter being joinedto said stem and having a blind chamber at its back, substantially asspecified.

EMORY C. IIISCOCK.

\Vitnesses:

H. M. llIUNDAV, L. E. CURTIS.

